What is a permutation matrix? Define 2x2 and 3x3 permutation matrices.
Lecture notes at https://github.com/mukherjeekoushiklearning/Matrix-Algebra-for-Beginners-/blob/main/Tutorial%209.pdf
https://www.youtube.com/watch?v=al2MqayPtUo&list=PL_h1k2DY0Uk-T_tA0CNgDK3SrnE-PKf2T
